package com.onlygx.dva.common.utils;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.UUID;

/**
 * 瞳见科技
 *
 * @author : GaoXiang
 * 时间 : 2021/12/31
 * 介绍 :
 */
public class IdGen8Utils {

    //生成 app_secret 密钥
    private final static String SERVER_NAME = "developer";
    private final static String[] chars = new String[]{"a", "b", "c", "d", "e", "f",
            "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
            "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
            "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
            "W", "X", "Y", "Z"};

    /**
     * 短8位UUID
     */
    public static String getGen8Id() {
        StringBuilder builder = new StringBuilder();
        String uuid = UUID.randomUUID().toString().replace("-", "");
        for (int i = 0; i < 8; i++) {
            String str = uuid.substring(i * 4, i * 4 + 4);
            int x = Integer.parseInt(str, 16);
            builder.append(chars[x % 0x3E]);
        }
        return builder.toString();

    }

    /**
     * <p>
     * 通过appId和内置关键词生成APP Secret
     * </P>
     */
    public static String getGen40Secret(String appId) {
        try {
            String[] array = new String[]{appId, SERVER_NAME};
            StringBuilder sb = new StringBuilder();
            // 字符串排序
            Arrays.sort(array);
            for (String s : array) {
                sb.append(s);
            }
            String str = sb.toString();
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(str.getBytes());
            byte[] digest = md.digest();

            StringBuilder hexStr = new StringBuilder();
            String shaHex;
            for (byte b : digest) {
                shaHex = Integer.toHexString(b & 0xFF);
                if (shaHex.length() < 2) {
                    hexStr.append(0);
                }
                hexStr.append(shaHex);
            }
            return hexStr.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            throw new RuntimeException();
        }
    }

    public static void main(String[] args) {
        for(int i=1;i<10;i++){
            String appId = getGen8Id();
            String appSecret = getGen40Secret(appId);
            System.out.println("appId: "+appId);
            System.out.println("appSecret: "+appSecret);
        }
    }
}
